About the book: 2012 / Peter Drucker’s most famous book raises the topic of the effectiveness of knowledge workers who acquire the status of a leader in a modern organization if, due to their position or knowledge they are responsible for work that directly affects a given organization's ability to function and achieve results. To become an effective leader, it is not enough to be smart and work hard. No special skills, talents or inclinations are required to be effective. To work effectively, a manager needs to follow certain - and quite simple - rules described and commented on in this book. Today, effective leaders are quickly turning into the most important resource of society, and effectiveness in a leadership position is becoming an urgent need for any person aimed at success, self-realization and achievement - both those who are just starting to work and those who have already traveled a certain path up the career ladder.